IsovoacangineIsovoacangine is a naturally occurring substance that has action on heart muscles in pigs.ChemistryDerivatives3-Hydroxyisovoacangine and 3-(2'-oxopropyl)isovoacangine are derivates of isovoacangine.Natural occurrenceIt occurs naturally in many Tabernaemontana species such as Tabernaemontana pachysiphon and Tabernaemontana divaricata.